Common Stock Repurchases - Narrative (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 28, 2015
Common Stock Repurchases (Textual) [Abstract]
Repurchased shares	448,436	0
Common stock purchased for treasury	$ 10,600,000
Shares remain available for repurchase	582,002
Repurchased shares tax withholding	72,996	50,156	56,885
Share repurchased relating to tax withholding requirements	1,800,000	1,300,000	1,100,000
Payments for Repurchase of Common Stock	12,321,000	1,328,000	1,656,000
Subsequent Event
Common Stock Repurchases (Textual) [Abstract]
Stock Repurchased				141,462
Payments for Repurchase of Common Stock				$ 3,800,000